/Engine/Source/Runtime/InteractiveToolsFramework/Public/BaseGizmos/GizmoElementBase.h
View align normal. PointEye rotates the normal to align with camera view direction. PointScreen rotates the normal to align with screen forward direction. Axial rotates the normal around the axis to align as closely as possible with the view direction.
virtual void SetViewAlignNormal ( FVector InAxis )